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Testing vacuum pump on 85-89 cruise control ? 200 1988

posted by  mike chase on  Sat Jun 25 15:11 CST 2005
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last visit: Fri Mar 12 05:48 CST 2010
[RELATED]

Some questions about 85-95 cruise control not covered in the FAQ:

1. Anybody know how to test the vacuum pump operation on the '85 to '89 cruise control? ( See diagram at http://mikechaseleadership/Curise.jpg )

From the diagram it looks like current is applied to post #3 on vacuum pump through the cruise control switch (is that correct?). Which post is ground applied to on the vacuum pump (#1 or #2?)? And why is there a third post?

2. How many inches of vacuum should the pump be able to pull?

3. Anybody know if the orientation of the Control Unit is critical? If yes, it is to be horizontal or vertical?

4. The Control Unit is grounded through pin #8. What is the signal that is applied to #3 on the Control Unit from the air valve switch and brake switch? Seems like it may be ground too (and if air valve or brake open the curcuit then there is no ground?) Is that right?

Mike

http://mikechaseleadership/Cruise.jpg






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